Berlin 2008 – scientific programme
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.1: Poster
Tuesday, February 26, 2008, 14:30–20:00, Poster A
Structure and Morphology of conducting Polymerfilms for Photovoltaic Applications — •Matthias Ruderer1, Ezzeldin Metwalli1, Weinan Wang1, Gunar Kaune1, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS E13, James-Franck-Str. 1, 85747 Garching, Germany — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
Conducting polymers have shown to be interesting candidates for photovoltaics due to their high absorption coefficient, low costs etc. Nevertheless there are stringent constraints in device fabrication due to the short exciton diffusion length. Therefore the structure of the polymerfilm is crucial. It was shown that a blended structure compared to a layered structure increases the efficiency [1].
In the presented work we focus on such blend films. Two conducting polymers of different classes, of poly(phenylene vinylene) (PPV) and polythiophene (PT) derivatives, are blended with different ratios. Films are prepared by using spin coating. With optical spectroscopy (UV/Vis and FT-IR) the absorbed part of the optical spectrum and the stability under ambient conditions is detected. The structure and morphology of the films are investigated with scattering methods (GI(U)SAXS) [2] and the critical blending ratio for the bicontinuous structure is determined.
[1] S. V. Chasteen, J. O. Härter, G. Rumbles, J. C. Scott, Y. Nakazawa, M. Jones, H.-H. Hörhold, H. Tillman, and S. A. Carter. J. Appl. Phys., 99:033709, 2006. [2] P. Müller-Buschbaum. Anal.Bioanal.Chem., 376:3, 2003.